Understanding MongoDB Indexes: Beginner-Level Quiz

MongoDB Indexes Quiz

Welcome to the MongoDB Indexes Quiz! This quiz will test your knowledge of one of MongoDB's most critical aspects: indexing. Indexes are vital in optimizing query performance, ensuring efficient data retrieval, and enabling specialized operations like geospatial queries and text searches. Mastering how MongoDB handles indexes is essential for anyone working with large datasets and performance-sensitive applications.

1 / 20

Which command is used to create an index in MongoDB?

db.collection.setIndex()

db.collection.addIndex()

db.collection.index()

db.collection.createIndex()

2 / 20

To support ________ based sharding, MongoDB provides a hashed index type.

root

primary

hash

all of the mentioned

3 / 20

________ index type, which indexes the hash of the value of a field.

Multikey

Hashed

Unique

None of the mentioned

4 / 20

MongoDB indexes use a _______ data structure.

Map

Hash

B-tree

All of the mentioned

5 / 20

What is the default behavior if no indexes are defined on a collection?

MongoDB performs a full collection scan

MongoDB throws an error during query execution

MongoDB automatically creates an index

The query is denied

6 / 20

Which of the following statements is correct?

The index stores the location of a specific field or set of fields, ordered by the value of the field

Indexes support the efficient execution of queries in MongoDB

If an appropriate index exists for a query, MongoDB cannot use the index to limit the number of documents it must inspect

None of the above

7 / 20

Which index type is used when a field in the collection contains an array of values?

Unique Index

Text Index

Compound Index

Multikey Index

8 / 20

What is a sparse index in MongoDB?

A type of index used to improve write performance

An index that limits the number of indexed documents

An index that stores only partial field values

An index that includes only documents where the indexed field exists

9 / 20

How can you list all the indexes on a MongoDB collection?

db.collection.showIndexes()

db.collection.findIndexes()

db.collection.getIndexes()

db.collection.listIndexes()

10 / 20

The _________ property for an index causes MongoDB to reject duplicate values for the indexed field.

Multikey

Unique

Hashed

None of the mentioned

11 / 20

Which index type would you use to perform geospatial queries in MongoDB?

GeoJSON Index

Spatial Index

2dsphere Index

3d Index

12 / 20

_____ indexes uses planar geometry when returning results.

All of the mentioned

13 / 20

What happens if you attempt to insert a duplicate value into a field with a unique index?

MongoDB will throw a duplicate key error

MongoDB will allow the insert without any issues

MongoDB will accept the value but remove the existing document

The new value will overwrite the old one

14 / 20

MongoDB provides a ________ index type that supports searching for string content in a collection.

text

string

char

none of the mentioned

15 / 20

MongoDB uses ______ indexes to index the content stored in arrays.

singlekey

compkey

multikey

none of the mentioned

16 / 20

Which of the following is a valid use case for a hashed index in MongoDB?

Distributing documents evenly across shards in a sharded cluster

Performing text searches

Sorting query results

Optimizing read performance on multikey fields

17 / 20

Which index would you use to ensure that each document in a collection has a unique value for a particular field?

Compound Index

Sparse Index

Multikey Index

Unique Index

18 / 20

Which of the following statements is correct?

Certain restrictions apply to indexes, such as the length of the index keys or the number of indexes per collection

For queries that specify compound query conditions, if one index can fulfill a part of a query condition, and another index can fulfill another part of the query condition, then MongoDB can use the intersection of the two indexes to fulfill the query

Whether the use of a compound index or the use of an index intersection is more efficient depends on the particular query and the system

None of the above

19 / 20

What is the purpose of a compound index in MongoDB?

To index multiple fields together for more complex queries

To ensure uniqueness across all documents

To index a single field with multiple values

To create separate indexes for each field in the collection

20 / 20

MongoDB supports the creation of user-defined ascending/descending indexes on a ______ field of a document.

Compound

Non Unique

Single

None of the mentioned

Your score is

The average score is 0%

MongoDB Indexes focuses on optimizing query performance in MongoDB by creating indexes on fields in a collection. It also explains how indexes speed up data retrieval by reducing the number of documents MongoDB needs to scan.

This quiz is designed for users who are familiar with basic MongoDB operations and want to enhance their knowledge of query optimization.

Best of luck!